Posterior Abdominal Wall Anatomy PDF
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Mansoura University
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Summary
This document provides an overview of the anatomy of the posterior abdominal wall, describing the muscles including quadratus lumborum and iliacus. Detailed information about their origins, insertions, nerve supply, and actions are covered. Additional information about the lumbar plexus and its relations is included.
Full Transcript
Posterior abdominal wall Quadratus Lumborum Origin: iliac crest & ilio-lumbar Ligament Insertion: Transverse process of upper 4 lumbar vertebrae & Last rib. Nerve supply: subcostal & upper 3 or 4 lumbar nerves Action: Unilateral acti...
Posterior abdominal wall Quadratus Lumborum Origin: iliac crest & ilio-lumbar Ligament Insertion: Transverse process of upper 4 lumbar vertebrae & Last rib. Nerve supply: subcostal & upper 3 or 4 lumbar nerves Action: Unilateral action: lateral flexion of trunk Bilateral action: Extension of trunk Iliacus Origin: iliac fossa & ala of sacrum Insertion: Lesser trochanter of femur. Nerve supply: femoral nerve Action: Flexion of thigh Anatomist “Posterior abdominal wall” Posas major Origin: Body of T12 & all lumbar vertebrae & inter-vertebral disc between Insertion: Lesser trochanter of femur. Nerve supply: upper 3 lumbar nerves Action: With iliacus: Flexion of thigh Unilateral action: lateral flexion of trunk. Bilateral action: Flexion of trunk Posas minor “may be absent” Origin: Body of T12 & L1 Insertion: Ilio-pubic eminence. Nerve supply: L1 Action: weak flexion N.B: TB infection of vertebral column may cause formation of abscess in psoas sheath called psoas abscess. The pus of psoas abscess may spread down to the thigh through psoas sheath Anatomist “Posterior abdominal wall” Lumbar plexus Site: Inside psoas major Formation: Ventral rami of upper 4 lumbar nerves Arrangement & branches: L1: gives iliohypogastric , ilioinguinal L1,2 forms genito-femoral nerve L2,3 form LCN of thigh L2,3,4 divide into anterior & posterior division to form: Obturator nerve "from anterior division" Femoral nerve "from posterior division L3,4 form obturator accessory Relation to posas major: Lateral to psoas major: Iliohypogastric Ilioinguinal LCN of thigh Femoral nerve Anterior to psoas major: Genitofemoral nerve Medial to psoas major: Obturator nerve Obturator accessory nerve Anatomist “Posterior abdominal wall”
